The marked price of an article is 80% more than its cost price. What should be the discount (in %) offered by the shopkeeper so that he earns a profit of 44%?

Let the C.P. of article be Rs. 100

∴ Its marked price = Rs.180

Its S.P = Rs. 144

∴ Discount = Rs. (180 – 144) = Rs. 36

If the discount percent be $x \%$, then

$frac{180 imes x}{100}=36$

$Rightarrow x=frac{36 imes 100}{180}=20 \%$